Place a 13- by 9- by 3-inch heavy-duty disposable foil baking pan in the middle of the grill. Add half of the plum tomatoes, olive oil, butter, sliced garlic, and thyme, stirring to incorporate butter as it melts. Cook until mixture begins to sizzle and garlic softens, about 2 to 3 minutes. Add clams in a single layer; pour clam juice and wine over them. Cover grill and cook until clams start to open, about 6 minutes.

Meanwhile, slice sausage, chile, and scallions and add to clam mixture along with corn pieces and remaining tomatoes. Cover grill and continue to cook 4 to 5 minutes until clams are fully opened (discard any that don't open). Remove pan from grill and stir in parsley, lemon zest, and lemon juice. Spoon into large bowls, dividing the broth evenly. Serve with garlic bread.

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